# TI-BASIC:Radian Symbol

**Command Summary**

If the calculator is in degree mode, the ^{r} (radian) symbol converts a radian angle to degrees.

**Command Syntax**

*angle*^{r}

**Menu Location**

Press:

- 2nd ANGLE to access the angle menu.
- 3 to select
^{r}, or use arrows and ENTER.

TI-83/84/+/SE

1 byte

{{Template:TI-BASIC:Markup cmd=^{r}}}

Normally, when the calculator is in degree mode, the trigonometric functions only return values calculated in degrees. With the ^{r} symbol you can have the angle evaluated as if in radian mode because it converts the angle into degrees.

One full rotation around a circle is 2π radians, which is equal to 360°. To convert an angle in radians to degrees you multiply by 180/π, and to convert from degrees to radians multiply by π/180.

In degree mode:

sin(π) \\sine of Pi degrees .0548036651 sin(π^^r) 0

In radian mode:

sin(π) 0 sin(π^^r) 0 \\There's no difference when in radians

# Optimization

When you only call the trig function once in a program and want it calculated in radians, instead of changing the mode you can just use ° to save one-byte (the newline from using the command Radian)

:Radian :sin(X) can be :sin(X^^r)

# Related Commands

- ° (degree symbol)